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Interference fringe produced by the diffraction grating Interferometer. Note the two slightly overlapping sets in the circular image of the field of view. The slight deviations from straight fringes are due to thermal gradients in the otherwise quiescent atmosphere, unavoidable in the present apparatus. There are about five and one-third fringes to the inch in each set. A 6100A filter was used in this photograph.
A standard fringe pattern. A photograph of isothermal contours in the atmosphere surrounding a heated cylinder (approximately 100°C) with walls one-quarter inch thick, one-half inch long, and an inside diameter of four inches. The interferometer was adjusted so that one fringe covered the entire field when no thermal gradients were present in the atmosphere.
Schematic diagram of diffraction grating interferometer.